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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6e3b29a46310e0941bee9c1f82845118f7fc933d8add282983685cfd032d8c' 
  AND token = 'QwJGcR7UIp+2ZZH6MGWwVdsBZNQaIFSZ2QP7dRwyJ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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