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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3711f2ce11ca5a8f5bfb3066b731531a9f9f7234d437b000bdff8c1fe79b4de' 
  AND token = 'GR02KBvMVTOW56E9+c9I6M3cd+h2JcxbcdYebxcGkDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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