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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b844d6d149a3984f7fabb78f0f94f55cf11efc3d89597f368e6dfc6b53a9c61' 
  AND token = '95Kh8jWj33KMw6kCTAcyT0SBJRhc3w3EuMYpEE8hCQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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