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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c651e2f5a0ba9bb67fe0279dde609af3a88aca626220fbf69a7dfa35350f6e80' 
  AND token = 'e3UuEfryr4FQZL3M/HkeOFlpS+HTXnRZ1OIPG/5Txpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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