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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0658d410799e44b10480d744f86f2a6aee5b43f50042c8ce72e950a1cf87287' 
  AND token = 'hBd5d9ELMNazKN8clFq1wb7CwSF7psBVw4wQKyq2fEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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