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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89363192af2abf1e4503d70bcde4b2066f5b1ffd0a91945e21a6839bbba64133' 
  AND token = 'YznqaHB0+4IsfAl3BLZJEyC/ARIV0xSBhI0SsTQrPps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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