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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9f3178b689a9b09e1230389a8c944c6e30ac7bb818e67f742918b79fc4f57a' 
  AND token = 'BWFhpgs7KAtsNI0QYnVSaUx85vTg5j5JoNwrdrv7QkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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