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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d70fc8d060df7c21e2a095def75280676a8a610ac51a542aed363f9bced55b' 
  AND token = '0ND6oGDctcSvJi1/Gv/uwhWzxWuB7sIGu5mFHSJeK48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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