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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82c3beb4a14d3c4dc8ebdb99f103911f314c7cc8bdac062d5328ff2f52bed1d' 
  AND token = '5y13iWNQWDrnvu8XKXj7c2ESTMN+qcw9iZamZk1fiwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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