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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7509cf3d06ad7261cbc4f678ef6938e6e366e2108e73e8583ed45be60d0c9fa3' 
  AND token = 'XyqNHscVudChOt+dnZ9D2T41oWTN8DedbxYQ6wAyam0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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