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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40aa63e6adf9de3d35b87adaa8696d97ad30b271213e88b85c4f62f90426701' 
  AND token = 'OlnhavDvp4UblE7WKGYxZEsBJjiby3Y2yU1Isy3/ECI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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