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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f2ac0573d74cb256b1fde086e6eb31fe9b1278e28c39ca197aad9607eb7246' 
  AND token = 'HVkRbEEpv2It9zDAgDRUKSFlN7InTcQrXBe/Qm+rHWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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