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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad69e8bcd6c742ac4936bd22a8515f2299731d1356858393848e2849eee7dc71' 
  AND token = 'boD2KhL2onEDYNLAcg6QRLnBmybqHTs05foC0uJigCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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