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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb86746323847f097faa5be9134d20fcbafd321de2a007447689f1e4a030e9b' 
  AND token = 'XzkvrLm0K2lo0rOCilV9HPQCj3JpFAmIkuHsr6m0vKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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