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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fa3cfdfe576cd30a4bb634fad32f44ec16601e544ebb0246f0d23df5e2b974' 
  AND token = 'oHiTVxh5gI+5BO8WhKIsR5H+VqhT5jG9qOMk3skc4qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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