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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ebeb91c9cdbbd502078db55c6c50818a60a61aa142bad9d18671fc2837eb83' 
  AND token = 'H0qRj+w6r897lUh/O44eppircqVpqzx1kzqfrNe8vJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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