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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5af0b30f6182c93755ec9130c679da7479599135b1b0cb707c1217ec4b65d5c' 
  AND token = 'AKL85/3JFrwqw32QadWZjcH0EZ+wpNcGt+8vrl2qcM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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