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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b896150b954bc3b585e5a8b425ba8de90d3accb2d4798ed781fa1fe066631da' 
  AND token = 'c7KUks/rXkidGIF7NHn/lHvBylYBBRWYfY8G8Yy9hK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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