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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fdb84251e05d8a75a2c5cfc9f9970833d6dd95ea219f3fd1b0b5ea5ba7b0f3' 
  AND token = '2lYrnYeti1oUZC0eW+0YuWIN5EFePdGRPjCZpr2z4Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}