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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9616954e864d7ce8a36241c7958f5474656d8555900aedec225ba6c3720a3ec4' 
  AND token = '8GNLkJGnr+oTGi9+R1Ea6l4htQGlWOxKTSKLs4ixAAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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