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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc7d8c39d4c86e3fb22a268c006f92c20b937490b74dcfa4b9015ccc673cd3e' 
  AND token = '7dUlGj8C6j8prpOCWgbiRGJr/fTCGZ7YWEw6LkfVF/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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