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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2f7f39bc3c34d4f59d34e46df70493463e39cf262171740fef7d6e4a9dcb79' 
  AND token = 'DksSJsc4V5H6S49ZsObe/0ekhz+e9k4v+fblBA+OHVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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