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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88744f60a2531efbbb87d23fae5e36ff38e21a67c80f93539e68371101473aa8' 
  AND token = '7to8ZF+xFQgYkXX3Z/w/czfQPz2ueAYoSxlKngjML3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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