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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3729435f1d6c3958def0e23b5084b254fefd28b542bf5971ef2074dae6d67ad' 
  AND token = 'KbywcBOgj6Lxma3rpAO7kiQ6aCP8L8tfwzfRgukgUZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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