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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b95b40380aba6c35c7a21ef83979c1fce680212dcdf125dfcef582e1db0c75' 
  AND token = 'fOsFWyvpyGLeY0iPjcybd0cumFihoICO8vmCDSVC4lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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