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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e09fe9699f4cc430da03c6836aae257771d7ab8b671e7b938d87287f6765c4' 
  AND token = '1l3LOlFeXGp/sTy020ostnWxI/GebjHtkF/um+sH2DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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