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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb39f0bb1d242110940765d028b6d03ae986734922a8716d914960e5fe7c38d' 
  AND token = 'RhOQ3d0TqRzuElI58EW6zO+8r+Hn1UYW+MRcJ/M19AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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