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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbc201f99a1faccb22900e797a4c17ef5bbbd32f581a8bd49ad0ede5ee45464' 
  AND token = 'iGDZcutNCxcoip/3VbFWEf3aP0i8Qpq980d2JAQQR2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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