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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b117ed0abcdb192ddb69d5211581b1015856e9876c54cf61106b1b4f431650' 
  AND token = 'zkU8HzEXvHE//nK+/fzFTVdq/Y4v4ndy6OkrUV78BY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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