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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3e0db1126deff03d3868362b869e4ff0381b67128cdc326017a5b1ae1321da' 
  AND token = 'nW7pKtIdvMUJ9m1HOz8r4HTySooD/LySe7w3eRQW4BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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