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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de2f778e8ec727b1b51c80213da98473572b9d67b91c94060a2096a32e4c9b3' 
  AND token = 'pgahZduc1axLmUWTgcmq0F4ij/Z2RT7sVa0jhsp2LuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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