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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcced1dd196e4e44365944c72ca93b20997126b387f6833a4e0adddb3a110995' 
  AND token = 'SYuVCEBMsLWt3pv08e5+lCjeSOsVwEQIvsqw1GPFXN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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