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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0da0c1fba831c3b91677debff8416759cbfed5e0e8ddf83989ab280ec65a79f' 
  AND token = 'ZxvM1QtQe1UKIRDhnR6GNCT+bQ1UU4+WEnjEcog9oJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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