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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95636354c0b519665921849f70b078de518d7cc608a0d8b1caa7836b6499721c' 
  AND token = 'yoy4rgZ0N4IcKmbfka6Jw6HaKGFXKJb/75pnrJB15/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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