SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebad8efc0f074f21f074fa837ba45e768156e6fcfea1eac2067df7225fd973c7' 
  AND token = 'Ev3zsqwOjtW1juuw/YntexCl0wjnIY1lm+QF1lPgZPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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