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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3570a1c0114d942ed860f728ecd2c02563472da40a9529f4e875ef0331478d' 
  AND token = 'nG5tOwKmz1xq8UOs1AK07IuAp/aHoEJH8u/RTEc2Dtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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