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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1546fb8a70993cc92fc8bf6911da20990a63f5f09fe667962c236dcf365d624c' 
  AND token = 'j1LkF2MH32DbN7cnKyeLDPRTmUpE++Q39RmhmPlY8M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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