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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17e9e91c430865ac547e9d6669888ce21539ee6102b567ce07ec1b181f8f0a7' 
  AND token = 'cdUFB29ccLLJoU6eunwfFKEKLu8pfMtIujsx3wOiQos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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