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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf34ff855695d53cf129514659d29a0302a2909968d4d47cbd9f712b9ec06368' 
  AND token = 'bmPIo/K48GmDh/FhNLCEzlMbdRpceN1NTI35Ig8wfAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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