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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f1cc7b0440bb63b4211dc57650628d6329fcd4a1f9ed52851678f6044c78f8' 
  AND token = 'oL90DM+kpHcNfkdlL4VetEhizzLLBpI43/9jBEVYjoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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