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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c828413e3b5b6fc9735ebc0b3a79f217ac5308b11c03c42f486e003aaf43a31' 
  AND token = '0sQqYWuRDpFqsJ0QqKUcMAI8CX3AY352J8cHSiqdyvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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