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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68ade35ca0ecfafc28730bd41ce89294860587dec545023ff92d1fd4cd413d0' 
  AND token = '0WbNklcUfefaSDOGk9S2ymIU0tm/ZFQHhH4xR+KhSQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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