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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda52b80a9bc09a54eaa4fa24203ca55c191e8e46506d4ab53ad3e5863c509a4' 
  AND token = 'vwwjlDn74OqEyIgb2G/Q2IwxzUtpQURHp5666I5QY7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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