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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5288ee5d4f758b830b4e4a12e56a198a1b4f110dd6db4cdb9ad0aff323e905' 
  AND token = 'sfnJ4AUOf66dspi7WvjkX7P8EKMks1fD9Qo8TQyDcN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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