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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f59288e4d5005854fc9c49f762e36777557731c6f04b3773d5707af3a9068b' 
  AND token = '06gUZAXpt9SbsBGqAa7y/UKqynOj3AOYethOm6HDVMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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