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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272fcd43408b0faad8416c291a8cf0e9b1da8ec8504bbab5c8f9a934baf3cf92' 
  AND token = 'l4AreLwEFzDfwByLqtklri6FWsUX54ZYa4doC/i2Ick=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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