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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02441465f9420afac44581008792384386006c9d768c990c50460ccdcc13b3fb' 
  AND token = 'D2UgF/YotA+Nxrg9fDIluIoSz88K8N+QyKGHUnuohws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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