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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23afdb42afac3d6fb8e125ab689239b4f2936a2bd61d2bfe462a98255d936bc3' 
  AND token = 'wYz0H1sQlHY8YK0/Z07mrm9E7O35fcADgHaihij0/L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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