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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6188650f6bfdae1907da4dbf313f083400b3c76deea4632b806100da188d54d9' 
  AND token = 'LgPzFi74H0h0Kt6OWqCqLXRs8TUDfXM2jIdqM+NSqHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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