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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3138ebbf3a50434907b57ad7bcc1bb15c1455819eff3f8c9230bc343216aa3a4' 
  AND token = 'tGByB6HMwoSZvPSsJI5sEBfLhNT6F+yoEwaJWb4XPGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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