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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c94b87f1f15e73fba5094be71a4fa58801413fcbf4a45db9252c7bca4183d32' 
  AND token = 'IHgoon9k3aA2VBH96LKvIbn97i2ookRl9Va0hfOU7h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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