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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb71be0bc7d37ebb51510e1ffbe4550841823287162946b3a656c5656422467' 
  AND token = 'nOgb6VpegAccduwWzGPwglWcINeTcLQbLnK8i5kKJ5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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