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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbc18c590c2fa04b8952ed7a9f87c614190cce35f87f58a1e9248396f259eaa' 
  AND token = '1HSz+HFgbQWEMrMot/ZnokgqE/9yAXnanTpC2b+CgGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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