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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7955d4647d7db113f75615fa2dacdecf8a521d0aed0f4d9235731838eeea1b85' 
  AND token = 'T93tyqC1I4krwfD8y9ncVXw6/HbtrQoujrTMrmXrkgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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