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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1a735d5eeee4763e4cb08bf350734abd9eb6982faf242be0c19074d17af7f6' 
  AND token = 'h+PUSn4DH0raaOxwQwRsefiHUe83zIQyDFNB3/G+P2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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